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The bind and steady state endpoint lifetimes were hardcoded to 30s and 5m, which makes tests reproducing relay-session-reap scenarios, e.g. in-process magicsock e2e tests and natlab VM tests for #20082 (black hole following relay session reap), take 5+ minutes of wall time. Add Server.SetLifetimes, which validates the new values and pokes the endpoint GC loop to reset its ticker so they take effect immediately, and a SetLifetimesForTest wrapper for brevity in in-process tests. For tests that run tailscaled as a separate process, e.g. natlab VM tests, expose it at runtime via a PermitWrite-gated LocalAPI debug endpoint, debug-peer-relay-server-lifetimes, mirroring the existing debug-peer-relay-sessions plumbing through the relayserver extension, with a corresponding client/local method. A LocalAPI hook is preferred over env knobs as it is per-instance and parallel-test-safe, and works after the relay server is started via the RelayServerPort pref. Production behavior is unchanged unless the hook is used. Updates #20082 Change-Id: I827c54b222a268cbdb90c41febfe95ae3f2295f2 Signed-off-by: James Tucker <james@tailscale.com>